题目内容
怎样算简便就怎样算. (1)9×
| (2)
| (3)
| (4)(
|
(1)9×
+
×9,
=(
+
)×9,
=1×9,
=9;
(2)
-
×
-
,
=
-
-
,
=
-(
+
),
=
-1,
=
;
(3)
÷[
×(
+
)],
=
÷[
×
],
=
÷
,
=
;
(4)(
+
)×8+
,
=
×8+
×8+
,
=5+
+
,
=5+(
+
),
=5+1,
=6.
5 |
18 |
13 |
18 |
=(
5 |
18 |
13 |
18 |
=1×9,
=9;
(2)
5 |
3 |
5 |
9 |
3 |
2 |
1 |
6 |
=
5 |
3 |
5 |
6 |
1 |
6 |
=
5 |
3 |
5 |
6 |
1 |
6 |
=
5 |
3 |
=
2 |
3 |
(3)
1 |
8 |
1 |
25 |
2 |
5 |
1 |
10 |
=
1 |
8 |
1 |
25 |
1 |
2 |
=
1 |
8 |
1 |
50 |
=
25 |
4 |
(4)(
5 |
8 |
1 |
27 |
19 |
27 |
=
5 |
8 |
1 |
27 |
19 |
27 |
=5+
8 |
27 |
19 |
27 |
=5+(
8 |
27 |
19 |
27 |
=5+1,
=6.
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